When btc dump, they dump
when btc pump, they even dump harder wtf
This easy to notice. Many new altcoins appearing daily. It's impossible that they all succeed.
That's why every ico must come with its new idea to solve or give another improvement to the crypto. Just like ethereum that gives the new platform and the idea about the smart contract.
Zcash with its zsnarks and zstarks in the future. A lot of icos were competing to attract the investor's attention.
Not all of them will be success.